//驗證碼類class ValidateCode { private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//隨機因子 private $code;//驗證碼 private $codelen = 4;//驗證碼長度 private $width = 130;//寬度 private $height = 50;//高度 private $img;//圖形資源句柄 private $font;//指定的字體 private $fontsize = 20;//指定字體大小 private $fontcolor;//指定字體顏色 //構造方法初始化 public function __construct() { $this->font = dirname(__FILE__).'/font/elephant.ttf';//注意字體路徑要寫對，否則顯示不了圖片 } //生成隨機碼 private function createCode() { $_len = strlen($this->charset)-1; for ($i=0;$i<$this->codelen;$i++) { $this->code .= $this->charset[mt_rand(0,$_len)]; } } //生成背景 private function createBg() { $this->img = imagecreatetruecolor($this->width, $this->height); $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255)); imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color); } //生成文字 private function createFont() { $_x = $this->width / $this->codelen; for ($i=0;$i<$this->codelen;$i++) { $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]); } } //生成線條、雪花 private function createLine() { //線條 for ($i=0;$i<6;$i++) { $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color); } //雪花 for ($i=0;$i<100;$i++) { $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255)); imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color); } } //輸出 private function outPut() { header('Content-type:image/png'); imagepng($this->img); imagedestroy($this->img); } //對外生成 public function doimg() { $this->createBg(); $this->createCode(); $this->createLine(); $this->createFont(); $this->outPut(); } //獲取驗證碼 public function getCode() { return strtolower($this->code); }}

session_start();require './ValidateCode.class.php'; //先把類包含進來，實際路徑根據實際情況進行修改。$_vc = new ValidateCode(); //實例化一個對象$_vc->doimg(); $_SESSION['authnum_session'] = $_vc->getCode();//驗證碼保存到SESSION中